US5760859A
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US
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Retardation layer having a dispersion adapted to the active liquid-crystalline cell
Assignee: Dejima Tech BV
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Filing: 1994-09-29
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Granted: 1998-06-02
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Expires: 2014-09-29
Abstract
Abstract The invention is in the field of retardation layers comprising high-molecular weight liquid-crystalline material for liquid-crystalline displays. The invention is directed to a retardation layer for a liquid-crystalline display comprising high-molecular weight liquid-crystalline material, wherein the dispersion has been adapted to that of the active liquid-crystalline cell by varying the mesogenic groups of the high-molecular weight liquid-crystalline material, so that the difference in dispersion between the active cell and the retardation layer in the wavelength area of 400-800 nm is not more than 0.1.
Inventors
- 👤 Martin Bosma
- 👤 Jan-Willem Venema
- 👤 Stephen James Picken
- 👤 Gustaaf Ronald Mohlmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:26
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; C; C07; C07D; C07D303/00; C07D303/02; C07D303/12; C07D303/18; C07D303/20; C07D303/22; C07C; C07C225/00; C07C225/22; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; C09K19/28; C09K19/30; C09K19/3001; C09K19/3086; C09K19/38; C09K19/3833; C09K19/3876; C09K19/388; C09K19/52; C09K19/60; G02B; G02B5/00; G02B5/30; G02B5/3016; G02F1/1335; G02F1/13363; G02F1/133636; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/25; C07C2601/00; C07C2601/06; C07C2601/10; C09K2323/00; C09K2323/06; G02F1/133637
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A method for making a liquid-crystalline display, which display comprises an active liquid-crystalline cell and a retardation layer comprising a high-molecular weight liquid-crystalline material comprising at least one mesogenic group, the method comprising adapting the dispersion of the retardation layer to that of the active liquid-crystalline cell by varying the mesogenic group or groups of the high-molecular weight liquid-crystalline material, so that the difference in dispersion between the active cell and the retardation layer in the wavelength area of 400-800 nm is not more than 0.1.
Claim 2
Independent Claim
86 words
A method for making a liquid-crystalline display, which display comprises an active liquid-crystalline cell and a retardation layer comprising a high-molecular weight liquid-crystalline material comprising at least one mesogenic group, the method comprising adapting the dispersion of the retardation layer to that of the active liquid-crystalline cell by varying the mesogenic group or groups of the high-molecular weight liquid-crystalline material, so that the difference in dispersion between the active cell and the retardation layer in the wavelength area of 400-800 nm is not more than 0.1.
Claim 3
Dependent Claim
32 words
The method of claim 1, wherein the high-molecular weight liquid-crystalline material is placed between two orienting substrates, giving one of the substrates a different orientation direction from that of the other substrate.
Claim 4
Dependent Claim
11 words
A liquid crystalline display made by the method of claim 1.
Claim 5
Dependent Claim
35 words
The liquid-crystalline display of claim 3 wherein the high-molecular weight liquid crystallime material comprises at least one mesogenic group having a large conjugated system and at least one mesogenic group having a smaller conjugated system.
Claim 6
Dependent Claim
30 words
The method of claim 1 wherein the difference in dispersion between the active cell and the retardation layer in the wavelength area of 400-800 nm is not more than 0.03.
Claim 7
Dependent Claim
19 words
The method of claim 4 wherein the ratio of mesogenic groups with large and small conjugated systems is varied.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein the dispersion is adapted by varying polarity of the mesogenic group.
Claim 9
Dependent Claim
11 words
The method of claim 1 wherein the mesogenic group is halogenated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-01 | 2001-12-01 | 2002-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-01 | 2005-12-01 | 2006-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-01 | 2009-12-01 | 2010-06-02 | $7700.00 | Window Closed / Lapsed |